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US Patent: 39,281
Improvement in Calipers
Patentee:
Charles A. Fairfield (exact or similar names) - Springfield, MA

USPTO Classifications:
33/558.09

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Unknown

Witnesses:
O. J. Burnett
Milton Bradley
Patent Dates:
Granted: Jul. 21, 1863

Patent Pictures: [ 1 | 2 ]
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Description:
Another method of micro-adjusting a pair of calipers, this one using a combination left-hand and right-hand thread.

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